Springs are widely used in electric tools, such as compression springs for button rebound, tension springs for resetting the cover of electric circular saws, torsion springs for pressing and rebounding switches, spiral springs for carbon brush compression, disc springs for clutch release, and waveform springs for axial elastic compression. These springs play important roles in achieving functions, ensuring product reliability, improving product safety, and enhancing human-machine comfort. Taking cylindrical compression spring as an example, the material and manufacturing process of electric tool steel wire are introduced below.

Common materials for cylindrical compression springs in electric tools include carbon steel wire (SW-A/B/C, 60, 65Mn, 70), piano steel wire (SWP-A/B/V), oil quenched and tempered steel wire (55CrSi, 65Mn, 50CrV, 60Si2Mn), stainless steel wire (such as SUS302, SUS304), etc.

The manufacturing process steps of cylindrical compression springs are generally divided into the following steps:
① Rolling. Set the spring winding machine based on rotation direction, outer diameter, free height, and total number of turns, and the spring winding machine will automatically roll;
② Tempering. Especially for cold drawing, tempering process can stabilize the shape of the spring, release residual stress during drawing and rolling process, and improve the fatigue strength of the spring;
③ Shot blasting. Removing burrs or surface defects, strengthening the surface, and eliminating stress are important means to improve the fatigue strength of springs;
④ Shaped tempering. After the shot blasting process, it is necessary to temper and shape it;
⑤ Press and hold. By preloading and applying pressure several times, the spring can eliminate pre deformation and achieve more stable elastic force in the later stage;
⑥ Grind the end face. Springs with end face grinding requirements require this process;
⑦ Surface treatment. Such as blackening, electroplating, and coating.